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Intangible Assets
9 Months Ended
Sep. 30, 2011
Intangible Assets [Abstract] 
Intangible Assets
5. Intangible Assets
Intangible assets consist of the following:
                 
    September 30,     December 31,  
    2011     2010  
    (Amounts in thousands)  
   
Intangible assets:
               
Purchased biomass conversion technology
  $ 2,599     $ 2,599  
Accumulated amortization
    (665 )     (535 )
 
           
Purchased biomass conversion technology, net
    1,934       2,064  
 
               
Technology licenses
    400       400  
Accumulated amortization
    (53 )     (38 )
 
           
Technology licenses, net
    347       362  
 
           
 
               
Intangible assets, net
  $ 2,281     $ 2,426  
 
           
Intangible asset amortization expense was $49,000 for the three months ended September 30, 2011 and 2010 and $145,000 for the nine months ended September 30, 2011 and 2010, respectively.